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I guess it`s a lot like the air inside your car when you are travelling at 60 MPH,the flies in your car can fly around inside the car just fine.
Aug 4, 2004 #10 ArmoSkater87
There are several factors involved in this situation...so its hard to tell now. You have bernouli affects, centripital acceleration, friction against the ground. Lets think about this, the car is moving, since air has very little friction, it takes a long time for it to start circulating. When it circulates, you have the air pressure drop from bernouli affects. The centripital force makes the air molecules pile up on the bottom of the tire, therefore, having a higher pressure. The friction of the tire against the ground heats up the rubber, but i think we can rule this one out because rubber is a bad thermal conductor. But there is another source of friction, which is the friction of the air against the bottom and sides of the tire (more against the botton since thats the area of higher pressure). SO, now we have higher pressure and temperature at the bottom of the tire, while a little lower pressure towars the center, but at the same time we have all this air circulating, which causes the overall pressure to go down (this is alll while the car is in motion). So, when the car slows down and stops, the air takes a little while to stop circulating (which makes it increase in pressure) because of the small amount of friction it has. At the same time you have the air (hot in the biginning) cooling down slowly, which causes a decrease in pressure. From my understanding of it, there is an equilibrium effect going on here. I dont think you can qualitatively conclude whether it will increase or decrease in pressure. Reference www.physicsforums.com...